Hsu's Ping is commonly known as Heizhai and Heishi. It belongs to the genus Amaranthidae. It is a marine fish that has been widely distributed in the temperate waters of the Northern Hemisphere from the Paleocene to the present. Perch species. The genus has a wide range of species and its distribution is relatively complex. There are only about 10 species in the offshore China. Some of these fish species, such as Hsu's ping, have a relatively high individual value and a beautiful flavour. It has a high economic value. In recent years, domestic and international emergence of breeding and aquaculture production. Some nurseries in Japan have reached a scale of several hundred thousand, and China has reached 200,000 to 300,000. The Korean aquaculture industry also has a certain scale, and it is a promising target for marine fish breeding. First, seedling breeding facilities can be used for breeding facilities such as real oysters and gums, and ready-to-use nurseries for shrimp, crab and shellfish can also be used. According to experiments, in the seaweed nursery, where the water depth is only 40 centimeters, a good seeding effect can also be obtained. Second, seed cultivation The stocking density of newly hatched larvae is bent and sinks at the bottom of the pool. After a period of time, it gradually floats, performs intermittent swimming, and gradually spreads in the pool. The stocking density of newly hatched larvae can be controlled according to the pond and culture conditions. Million/cubic meters. 2. During the cultivation of water temperature, the temperature of the pool water generally changes with the temperature and temperature of the natural seawater. If there are heating conditions, in order to accelerate the growth and development of larvae, warming methods can be used. According to experiments, the accumulated temperature required for larvae raised to 22 mm at different water temperatures is 619 to 627°C when the average water temperature is 14.4°C to 14.6°C, and 462°C when the average water temperature is 18.5°C. The specific method of raising the temperature is to grasp the daily increase no more than 1°C, reach the optimum temperature or the desired temperature, and then keep stable until the nursery is over. 3. Inflatable generally a gas stone per 2 square meters, continuous inflated; according to the development of larvae and adjust the volume of gas. The pre-micro-inflation gradually increases the air volume as the larvae grow. 4. Sewage suction larvae have a certain ability to swim, with a suction device to remove the bottom of the dead fish and other contaminants to reduce water pollution, 3 days after the start of feeding, cleaning once a day, and depending on the water quality conditions increase cleaning frequency. 5. Changing water to cultivate seawater is used after natural seawater has been screened and filtered, or sand is used to filter water. At the beginning of the time, micro-flowing water, with the growth of fish and the increase of feeding amount, gradually increase the amount of water flow, changing 1 to 2 ranges of water daily, and increasing it to 3 to 4 ranges in the later period, and depending on the quality of water In 3 days to 5 days, change the water or pour the pool once. 6. The water quality factor control dissolved oxygen is usually kept above 5 ml/l and the pH is stabilized at 7.8-8.6. If the surface light intensity does not allow the algae to multiply in the pool water, it is not necessary to properly increase the light. 7. When the fish were fed into the cultivation pond, they were inoculated with 300,000 cells/ml to 400,000 cells/ml of Chlorella, and Chlorella was added every day to maintain this concentration. On the 3rd day after the larva output, rotifers were started to be fed, and the density was about 3/ml to 5/ml. The rotifer is a good open-mouth bait for Hushi's flat, rotifers are generally about 200 microns, and larvae have a crack of 400 microns, and larvae are able to feed on their own initiative. On the 6th to 7th days, Artemia nauplii was added and the amount fed was kept at 0.1/ml to 0.2/ml, and the amount of rotifer feeding was gradually reduced to keep it at 1/ml to 2 /ml. Artemia nauplii is an ideal supplementary diet for larvae after 6 days, and it is easy to batch hatch. The feeding rate of larvae is high. However, since the nutrition of Artemia larvae is not complete enough for marine larvae, nutrient fortification is usually required before feeding. The method consists of cultivating newly hatched Artemia nauplii for 6 hours to 12 hours using emulsified fish oil, and then feeding the fish fry. At present, the cost of Artemia eggs is relatively high, but the appropriate length of Artemia can increase the survival rate of seedlings. On the 14th day, when the larvae were about 7.5 mm in length, except for Artemia nauplii 0.2 to 0.35/ml, the amount of feed was adjusted appropriately according to the daily yield. From the 30th day to the 35th day, the larvae had a total length of 15 mm to 20 mm and began to cast fish, shrimp, and other dead baits. After the 40th day, the larvae become juveniles. When the total length of the larvae is more than 22 mm and they can fully feed on the dead bait, they can proceed to prepare for the juvenile fish cultivation.
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